ISO 4401-03; NFPA-D03; 315 bar (4500 psi); 60 L/min (15.7 USgpm)

GB 2027B

1

VICKERS®

SystemStak® Valves

Build a Compact, Cost-Effective, Reliable HydraulicSystem with Vickers SystemStak� Valves

Reduces System SpaceRequirementsSystemStak valves make compacthydraulic systems in which specificfunction valves are “sandwich” mountedbetween a directional valve and astandard mounting surface.

Reduce CostSystemStak valves eliminate intervalvepiping and leak-prone tube and pipeconnections. Installed cost is less thanwhen using conventional valves.

Versatile and Easy to InstallSystemStak valves have all the internalpassages necessary to serve thedirectional valve topping them. Mountingsurfaces and port patterns are tointernational standards: any valveconforming to ISO 4401 size 03;ANSI/B93.7M size D03; NFPA-D03;CETOP 3; and DIN 24340, NG6mounting interface can be used withthese SystemStak valves.

Rugged and ReliableInternal working parts are produced fromhardened steel and mounted in ductile(spheroidal graphite) iron bodies.Excellent reliability is ensured. Workingparts are accessible without removingvalves from an assembled stack.

SystemStak Systems... Easy toUnderstand, Easy to DesignSystemStak circuitry is best shownusing slightly different symbols thanthose for traditional valve configurations.Each SystemStak symbol has the samebasic form and size as shown in fig. 1.

Figure 1

P T AB

Figure 2

P T AB

For ease of understanding, rememberthe directions of flow for each line, andthat all four flow paths pass througheach valve (see fig. 2). For clarity,directional valves are drawn vertically inSystemStak circuit diagrams (see fig. 3).

Figure 3

P T AB

Each station (valve stack) is acombination of functions. Whendesigning and assembling SystemStakvalves, care must be taken to ensurethat they interact as required by stackingthe functions in the correct sequence(fig. 4 is an example).

Figure 4

P T AB

Relief valves should normally bepositioned next to the mounting surface(i.e. at the bottom of the stack). Whenboth a flow control and a pilot operatedcheck valve are required, it isrecommended that the flow control valvebe between the check valve and theactuator to prevent check valve chatter.

Figure 5

P

T

AB

A combination of directional valve,SystemStak valve(s) andsubplate/manifold block (fig. 5: singlestation subplate and fig. 6: multi-stationmanifold) completes the assembly.

2

Fig. 7 represents a completeSystemStak system, showing typicaluse of functions available from thisrange. The circuit diagram also showsthe use of a tapping plate for accessingline pressure readings, and a blankingplate to close off an unused station of amulti-station manifold.

SystemStak Systems . . . Easy to Understand,Easy to Design

Figure 6

P

T

AB AB

Figure 7

P

T

AB AB AB

3

Table of Contents

4

Function Basic symbol Basic model Features Page

Relief DGMC Single, dual and crossport models

5

Counterbalance DGMR Control in port T 9

Sequence DGMR1 Single port P sequence 9

Reducing/relieving DGMX Piloted from (and reduced pressure in) port P, A or B

9

Direct check DGMDC Single check in any port; dualcheck in ports A and B only

13

Pilot operated check DGMPC Single in port A or B; dual in ports A and B

16

Flow restrictor DGMFN Single or dual port, meter-inor meter-out

19

Further information:Mounting bolts, subplates and manifold blocksHydraulic fluidsFiltration requirementsTemperature limitsPressure drop at other viscositiesTypes H and K adjustersWarranty and repairOrdering procedure

22

Operating Data

Maximum flow rate 60 L/min (16 USgpm)

Maximum operating pressure 315 bar (4500 psi)

Pressure drops See graphs

Mounting position Optional

Mass, Approximate:DGMC 1,3 kg (2.9 lb). . . . . . . . . . . . . . . . DGMC2 2,5 kg (5.5 lb). . . . . . . . . . . . . . . DGMR(1) 1,3 kg (2.9 lb). . . . . . . . . . . . . . DGMX 1,3 kg (2.9 lb). . . . . . . . . . . . . . . . DGMDC 1 kg (2.2 lb). . . . . . . . . . . . . . . . . DGMPC 0,8 kg (1.8 lb). . . . . . . . . . . . . . . DGMFN 1,1 kg (2.2 lb). . . . . . . . . . . . . . .

Relief ValvesDGMC-3-4*DGMC2-3-4*

General DescriptionThese two-stage adjustable pressurerelief valves limit the maximum pressurein the line(s) controlled by the integralrelief valve elements.

Pressure adjustment options of controlknob (with or without keylock) orscrew/locknut design are available. Thetwo-stage operation is basically identicalto long-established balanced pistonvalves, described in detail in VickersIndustrial hydraulics manual.

Typical Section

Functional SymbolsFor simplicity these two-stage valves arerepresented as single-stage models

P T B A

DGMC-3-PT-**

DGMC2-3-AT-**-BT-**

DGMC-3-BA-**

DGMC2-3-AB-**-BA-**

P T B A

P T B A

P T B A

Model Code for Relief ValvesDGMC(2) -3- ** - * (-B* - * * )- * - 4*

1 2

*

3 4 5 6 7 8 9

1 Type2 = Dual relief function Omit for single relief function

First functionSingle relief, or first line of dual models

Code Pressure Discharge Usagelimited in into

PT P T Single onlyAB A B Single, or dual with BABA B A Single onlyAT A T Single, or dual with BTBT B T Single only

2

3

4

Pressure adjustment range, firstfunction

A = 3-50 bar (43.5-725 psi)B = 3-100 bar (43.5-1450 psi)C = 10-200 bar (145-2900 psi)G = 50-315 bar (725-4500 psi)

Pressure adjustment/ lockingmethod, first function

H = HandknobK = Micrometer with keylockW = Screw and locknut

5

Pressure adjustment range,second function

Options as in

Pressure adjustment/ lockingmethod, second function

Options as in

Gage port: option on AT and PTsingle models only

B = G1/4� (1/4 BSPF)S = SAE 4 (7/16�-20 UNF-2B)Blank = No gage port

Design number, 40 series Subject to change. Installationdimensions unchanged for designnumbers 40 to 49 inclusive.

7

6

8

9

Performance CharacteristicsPressure overrideTypical performance for PT models at max. pressure settings with mineral oil at21 cSt (102 SUS) and at 50�C (122�F).

350

300

250

200

150

100

50

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

1000

2000

3000

4000

5000

psi

Pre

ssur

e

Flow rate

3

4

Second functionSecond line of dual models

Code Pressure Discharge Usagelimited in into

BA B A Dual withAB

BT B T Dual withAT

Omit for single line models

5

6

Relief ValvesDGMC-3-4*DGMC2-3-4*

Installation Dimensions in mm (inches)

DGMC(2)-3**-**(-B*-**)-4*Models with type W adjuster

To adjust valve setting slacken off locknutand turn adjuster screw . Turn clockwise to increase pressure;

counter-clockwise to decrease pressureRe-tighten locknut after completingadjustment.

For gage port thread options see model code

A

PB

T

A

P

B

T

A max.

79 (3.1)fully out

Line B or line P adjustment(according to model type)

Line A adjustment

B max.

4 (0.16) max. over gage port plug

4 (5/32) A/F hex. socket 40(1.57)

3,5 (0.14) Ø3 (0.12 dia)

20(0.79)

47,6(1.87)

46(1.8)

39 (1.54)

76 (3)

C max.

D max.

4 off “O” seals supplied for this mounting face4 holes through: Ø5,3 (0.21 dia)

12,7 (1/2) A/F hex. locknutTorque to 25-30 Nm (18-22 lbf ft)

8

Model A B C D

DGMC-3-AT-*W-4* – – 154 (6.1) –DGMC-3-BT-*W-4* – – – 156 (6.2)DGMC-3-AT-*W-*-4* – 160 (6.3) – –DGMC-3-PT-*W-4* – – – 156 (6.2)DGMC-3-PT-*W-*-4* – 160 (6.3) – –DGMC2-3-AT-*W-BT-*W-4* 234 (9.2) – – –

7

Model E F G

DGMC-3-AB-*W-4* – – 164 (6.5)DGMC-3-BA-*W-*-4* – 164 (6.5) –DGMC2-3-AB-*W-BA-*W-4* 234 (9.2) – –

A

PB

T

E max.

Line B adjustmentLine A adjustment

16,75 (0.66)

8 (0.13) max.

G max.

F max.

16,75 (0.66)

10 (0.4) max.

8

Installation Dimensions in mm (inches)

Pressure Controls: Counterbalance, Sequence and Pressure Reducing ValvesDGMR(1)-3-4*DGMX*-3-4*

General DescriptionThese single-stage valves operate bythe application of pressure on the end ofthe valve spool, acting against a springwhich is loaded by means of theadjustment mechanism.

In the counterbalance and sequencevalves the spool is offset by the springsuch that flow cannot pass through thevalve. When the force exerted by thepilot pressure on the spool end exceedsthe force of the main spring, the spool ismoved to allow flow through the valve.

In the pressure reducing valve the flowpath is normally open and is closed asthe pilot pressure exceeds the setting ofthe valve. Excessive pressure in thereduced-pressure line is prevented by apressure relieving function.

Pressure adjustment options of controlknob (with or without keylock) orscrew/locknut design are available.

Typical Section

Functional Symbols

P T B A

DGMR-3-TA

DGMR1-3-PP

DGMX*-3-PA

DGMX*-3-PB

DGMX*-3-PP

P T B A

P T B A

P T B A

P T B A

9

Model Code for Counterbalance, Sequence and Pressure Reducing Valves

DGM *(*) -3- ** (*) * 4*

1

1

2

*

3 4 5 6 7

TypeR = Counterbalance functionR1 = Sequence functionX1 = Pressure reducing, underlappedX2 = Pressure reducing, overlappedX3 = Pressure reducing, overlapped,

low leakage

Function portsFor DGMR only:TA = Counterbalance control function in

“T” port, controlled by pressure in “A” port

For DGMR1 only:PP = Sequence control in “P” port,

controlled by pressure in “P” portFor DGMX only:PA = Pressure reducing function in line

P, piloted from APB = Pressure reducing function in line

P, piloted from BPP = Pressure reducing function in line

P, piloted from P

Adjuster locationOption on DGMX onlyL = Adjuster at “A”-port end of valveBlank = Adjuster at “B”-port end of valve

Pressure adjustment rangeFor DGMX only:Y = 1,40-7,0 bar (21-101 psi)R = 1,40-45,0 bar (21-652 psi)For DGMR and DGMX:A = 3-30 bar (43.5-435 psi)B = 3,5-70 bar (51-1000 psi)C = 10-140 bar (145-2000 psi)F = 20-250 bar (290-3625 psi)

Pressure adjustment/ lockingmethod

H = HandknobK = Micrometer with keylockW = Screw and locknut

2

3

4

5

- - * -

6

7

Gage portB = G1/8� (1/8 BSPF)S = SAE 4 (7/16�-20 UNF-2B)

Design number, 40 seriesSubject to change. Installationdimensions unchanged for designnumbers 40 to 49 inclusive.

10

Typical performance with mineral oil at 21 cSt (102 SUS) and at 50�C (122�F).

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

1000psi

10

20

30

40

50

60

70

200

400

600

800

Red

uced

pre

ssur

e se

tting

Q max.

DGMX*-3-P*Low Pressure/Flow Rate Minimum Performance

Effect of Back-PressureThe effective reduced pressure is equalto the valve adjustment setting plus anyback-pressure in line T

Dead Head LeakageTypical leakage flow at 250 bar inletpressure from reduced pressure line intoT at “Dead Head” condition (i.e. No flowrequired at the reduced pressure outlet.)This leakage flow must be provided atthe inlet line P in order to maintain thereduced outlet pressure.DGMX1-3 = 1600DGMX2-3 = 400DGMX3-3 = 80

300

250

200

150

100

50

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

1000

2000

3000

4000

psi

Pre

ssur

e

Flow rate

DGMR1-3-PP

300

250

200

150

100

50

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

1000

2000

3000

4000

psi

Pre

ssur

e

Flow rate

DGMX*-3-P*

DGMX1-3DGMX2-3DGMX3-3

46 2

10200

Reduced pressure lineReverse flow to T line

Performance Characteristics

11

DGMR-3-TA-**-*-4*DGMR1-3-PP-**-*-4*DGMX(*)-3-P*(L)-**-*-4*

Models with type W adjusterTo adjust valve setting slacken off locknut and turnadjuster screw Turn clockwise to increase pressure;

counter-clockwise to decrease pressure.Re-tighten locknut after completing adjustment.DGMX2-3-**L models have adjuster and endcap/gage port locations interchanged from positionsshown.

Installation Dimensions in mm (inches)

A

P

B

T

A

P

B

T

14 (0.55) max.

4 (5/32) A/F hex. socket40(1.57)

3,5 (0.14) Ø3 (0.12 dia)

20(0.79)

47,6(1.87)

46(1.8)

39 (1.54)

76 (3)

4 off “O” seals supplied for this mounting face4 holes through: Ø5,3 (0.21 dia)

12,7 (1/2) A/F hex. locknutTorque to 25-30 Nm (18-22 lbf ft)

80 (3,1) max.

For gage port thread options see model code ,(pressure plug fitted)

6

12

General DescriptionThese valves allow free flow in one direction in the line in which the checkvalve element(s) is (are) located; flow inthe opposite direction is not possible.

Direct Check ValvesDGMDC-3-4*

Typical Section

Functional Symbols

P T B ADGMDC-3-X-A*

DGMDC-3-Y-A*

DGMDC-3-X-B*

DGMDC-3-Y-B*

DGMDC-3-Y-P*

DGMDC-3-X-T*

DGMDC-3-Y-A*-B*

P T B A

P T B A

P T B A

P T B A

P T B A

P T B A

Model Code for Direct Check ValvesDGMDC-3- * (- * * )- 4*

1

3 4 5 6

Direction of flowX = Free flow away from actuatorY = Free flow towards actuator

Check locationA = A lineB = B lineP = P line; with Y in T = T line; with X in

Check valve opening/crackingpressure

K = 1 bar (14.5 psi)M = 2,5 bar (36 psi)N = 5 bar (72 psi)

Check location (second elementof dual model)

Only available as model typeDGMDC-3-Y-A*-B*-4*B = B line

Check valve opening/crackingpressure (second function of dualmodel)

Options as in

Design number, 40 seriesSubject to change. Installationdimensions unchanged for designnumbers 40 to 49 inclusive.

2

3

4

5

- * *

21

1

1

3

6

13

Performance Characteristics

Typical performance with mineral oil at 21 cSt (102 SUS) and at 50�C(122�F)

Pressure drop: free flow through check valve

Internal Leakage Across ClosedCheck ValveLess than 0,25 ml/min (0.015 in3/min) at250 bar (3625 psi)

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

psi

Flow rate

3

6

9

1215

18

21

24

27

30

100

200

300

400

Pre

ssur

e dr

op

For other viscosities, see “FurtherInformation”.

14

Installation Dimensions in mm (inches)

DGMDC-3-Y-A*-B*-4* DGMDC-3-X-A*-4*DGMDC-3-X-T*-4*DGMDC-3-Y-A*-4*DGMDC-3-Y-P*-4*

DGMDC-3-X-B*-4*DGMDC-3-Y-B*-4*

Model type H

DGMDC-3-X-A*-4* DGMDC-3-X-B*-4* DGMDC-3-Y-P*-4*

DGMDC-3-X-T*-4* DGMDC-3-Y-A*-4* 23,25 DGMDC-3-Y-B*-4* (0.92) DGMDC-3-Y-A*-B*-4*

16,75(0.66)

A

P

B

T

A

P

B

TA

P

B

T

40(1.57)

3,5 (0.14) Ø3 (0.12 dia)

H

47,6(1.87)

46(1.8)

39 (1.54)

76 (3)

4 off “O” seals supplied for this mounting face4 holes through: Ø5,3 (0.21 dia)

101 (4) max.

13(0.51)

H

89 (3.5) max.

13 (0.51)

H

88 (3.46) max.

12(0.47)

15

General DescriptionThese valves provide pilot operatedcheck functions in one or both servicelines (A or B), the operating pilot supplycoming from the opposite service line.Thus with pressure in one service linethe check valve in the other service linewill be open (subject to system/actuatorpressures being correct for the valvearea ratios).

A 3:1 area ratio of pilot piston to checkvalve seat is supplemented by anoptional 10:1 decompression feature.

Pilot Operated Check ValvesDGMPC-3-4*

Typical Section

Functional Symbols

P T B A

B1 A1

DGMPC-3-(D)AB*-(D)BA*

P T B A

B1 A1

DGMPC-3-(D)AB*

P T B A

B1 A1

DGMPC-3-(D)BA*

Model Code for Pilot Operated Check ValvesDGMPC-3-(D) [- ** *] 4*

1

3 4 5 6

Decompression featureD = 10:1 decompression ratioOmit if not required

FunctionAB = Check in line A, pilot operated

from line BBA = Check in line B, pilotoperated

from line A (single check model only)

Check valve opening/crackingpressure

K = 1 bar (14.5 psi)M = 2,5 bar (36 psi)N = 5 bar (72 psi)

Decompression feature (secondfunction of dual models)

As in Omit for single line models,and if notrequired for dual modelsNote: “D” must be specified here, for dual models, ifcalled for in

Second function of dual modelsBA = Check in line B, pilot operated

from line AOmit for single line models

2

3

4

5

** *

21

1

3

6

(D)

7

1

7

-

Check valve opening/crackingpressure (second function of dualmodels)

Options as in Omit for single line models

Design number, 40 seriesSubject to change. Installationdimensions unchanged for design numbers 40 to 49 inclusive.

16

Performance Characteristics

Pressure Drop DataTypical performance with mineral oil at21 cSt (102 SUS) and at 50�C(122�F) u

Pressure drop: flow path A1 to A or B1 to B (no pilot-pressureoperation)

Pressure drop: flow path A to A1, or B to B1 with check valvepilot-operated fully open

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

psi

Flow rate

200

Pre

ssur

e dr

op

100

10

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

psi

Flow rate

3

6

9

1215

18

21

24

27

30

100

200

300

400

Pre

ssur

e dr

op

5

15

20

25

300

u For other viscosities see “Further Information”.

Pilot PressuresPilot area ratios:Main check valve 3:1. . . . . . . . . . . . . . . . Decompression poppet 10:1. . . . . . . . . . Use applicable ratio and opening/cracking pressure to calculate pilotpressure to open valve element, appliedto the following formulae:

To open valve or decompression poppetin line A:

Pressure at B1 =

To open valve or decompression poppetin line B:

Pressure at A1 =

Where:pA = Pressure at ApC = Cracking/opening pressurepA1 = Pressure at A1pB = Pressure at BpB1 = Pressure at B1A =B =A1=B1=

LeakageLess than 0,25 ml/min (0.015 in3/min) at250 bar (3625 psi).

pA � pC – pA1

Area ratio factor+ pA1

pB � pC – pB1

Area ratio factor+ pB1

Service line location;see functional symbols

17

Installation Dimensions in mm (inches)

A(A1)

PB(B1)

T

A

P

B

TA

P

B

T

40(1.57)

3,5 (0.14) Ø3 (0.12 dia)

47,6(1.87)

46(1.8)

39 (1.54)

76 (3)

4 off “O” seals supplied for this mounting face4 holes through: Ø5,3 (0.21 dia)

101 (4) max.

13(0.51)

97 (3.82)

13(0.51)

97 (3.82)

12 (0.47)

23(0.9)

DGMPC-3-(D)AB*-(D)BA*-4* DGMPC-3-(D)AB*-4*

DGMPC-3-(D)BA*-4*

18

General DescriptionThese valves regulate flow by means of an adjustable orifice which is notpressure compensated, and flowthrough the valve is entirely dependentupon pressure drop at any particularsetting of the orifice.Dual service-line models with an integralnon-return valve around each controlorifice provide for meter-in or meter-outcontrol; single line versions of these areavailable.

For flow restriction in P or T lines (wherereverse free flow is not required) modelswithout check valves are available.

Adjustment options are eitherscrew/locknut or handknob.

Flow Restrictor Valves DGMFN-3-4*

Functional Symbols

Typical Section

P T B A

DGMFN-3-X-A**-B**

DGMFN-3-Y-A**-B**

DGMFN-3-Z-P**

DGMFN-3-Z-T**

P T B A

P T B A

P T B A

Model Code for Flow Restrictor ValvesDGMFN-3- 4*

1

3 5 6

2

* *

21

(-

7

- * *

4

* * * )-

8

Direction of flow control (withrespect to machine actuator)

X = Meter-in control, applicable to linesA and B

Y = Meter-out control, applicable to lines A and B

Z = Meter-in control, line P only and meter-out control, line T only.

Location of control function(single model or first line of dualmodel)

P = Line P (single model only)T = Line T (single model only)A = Line A (single model or first line of

dual model)B = Line B (single model only)

Type of control needle/orifice(single model or first line of dualmodel)

1 = Fine control 2 = Standard control

Adjuster type (single model orfirst line of dual model)

H = HandknobW = Screw/locknut

Control in second lineB = Line B (use for dual models with

“A” specified at )Omit for single models

Type of control needle/orifice(second line of dual models)

Options as in Omit for single models

Adjuster type (second line of dualmodels)

Options as in Omit for single models

Design number, 40 seriesSubject to change. Installationdimensions unaltered for designnumbers 40 to 49 inclusive.

3

4

5

2

3

6

7

4

8

19

Performance Characteristics

Pressure DropTypical performance with mineral oil at 21 cSt (102 SUS) and at 50�C(122�F)

Type “1” needle (see model codes and ) Type “2” needle (see model codes and )

Free flow through check valve

3 6 3 6

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

psi

Flow rate

30

200

400

Pre

ssur

e dr

op

Number of turns of adjuster

1 2 3 4 5 6

10

20

40

50

60

600

800

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

psi

Flow rate

30

200

400

Pre

ssur

e dr

op

Number of turns of adjuster

1 2 3 4

5

6

10

20

40

50

60

600

800

0

bar

50 6040302010 L/min

0 4 8 12 16 USgpm

0

psi

Flow rate

200

Pre

ssur

e dr

op 150

100

50

14

2

468

1012

For other viscosities see “Further Information”.

20

DGMFN-3-X-***(-***)-4*DGMFN-3-Y-***(-***)-4*DGMFN-3-Z-***-4*

Models with type W adjusterTo adjust valve setting, slacken off locknut and turnscrew . Re-tighten locknut after completingadjustment.

Turn clockwise to decrease flow (increase restriction);counter-clockwise to increase flow (reduce restriction).

Model A B C D E

DGMFN-3-X-A*W-4* 121 (4.76) – – – 16,75 (0.7)DGMFN-3-X-A*W-B*W-4* – – 167 (6.6) – 16,75 (0.7)DGMFN-3-X-B*W-4* – 122 (4.8) – – 16,75 (0.7)DGMFN-3-Y-A*W-4* 121 (4.76) – – – 23,25 (0.9)DGMFN-3-Y-A*W-B*W-4* – – 167 (6.6) – 23,25 (0.9)DGMFN-3-Y-B*W-4* – 122 (4.8) – – 23,25 (0.9)DGMFN-3-Z-P*W-4* – – – 123 (4.8) 16,75 (0.7)DGMFN-3-Z-T*W-4* – – – 123 (4.8) 23,25 (0.9)

Installation Dimensions in mm (inches)

A

P

B

T

A

PB

TA

P

B

T

Line B or line P adjustment(according to model type)

39 (1.54)

76 (3)

C max.

45 (1.8)max.

47,6(1.87)

46(1.8)

4 off “O” seals supplied for this interface4 holes through: Ø5,3 (0.21 dia)

A max.

4 (5/32) A/F hex. socket

40(1.57)

3,5 (0.14) Ø3 (0.12 dia)

E max.

12,7 (1/2) A/F hex. locknut .Torque to 25-30 Nm (18-22 lbf ft)

Line A or line T adjustment(according to model type)

B max.

D max.

47 (1.85)max.

E max.

56 (2.2)max.

Ø32 (1.26 dia)

M4 locking screw2 (5/64) A/F hex. socket

Type H adjuster

21

Mounting Bolts,Subplates and ManifoldBlocksMounting BoltsThe length of mounting bolt used toinstall a SystemStak assembly isdependent on the number of valvesbeing used, plus the length needed formounting other valves in the assembly,such as:– solenoid operated, or other type of

directional valve– tapping plate– blanking or crossover plate.

Vickers offers a large selection of boltkits (one bolt kit for these SystemStakvalves comprises 4 bolts) in metric andinch sizes as listed. To determine yourneeds, use the following guide for boltlength calculation.

Further Information

A = Bolt clamp length in directional valve, blankingplate, crossover plate, etc.

B = Height of intermediate valve stack, comprisingVickers SystemStak valve(s) plus tapping plates, etc.

C = Depth of thread engagement in sub-plate/ manifold block:8/10 mm (0.3/0.4�), valid for:315 bar (4500 psi) when using cast iron or steel subplates/manifold blocks, or 210 bar (3045 psi) when using Vickers aluminium alloy manifold blocks.

L = Required bolt length; select from the table.

Notes1. Bolts should be torqued to 7-9 Nm (63-80 lbf in)

with threads lubricated.2. If not using Vickers bolt kits, bolts must be to

Grade 12.9 (ISO 898) or better.

A

B

C

L

Bolt Kit Selection

Metric: M5-6g Inch: 10-24 UNC-3A

Length Vickers bolt Length Vickers bolt(mm) kit number (in) kit number

50 BKDG3699M 2.0 BKDG369860 BK466836M 2.375 BK46684970 BK464125M 2.75 BK87001780 BK466837M 3.125 BK46685090 BK466838M 3.5 BK466851

100 BK466839M 3.937 BK466852110 BK466840M 4.312 BK466853120 BK466841M 4.75 BK466854130 BK466842M 5.125 BK466855140 BK466843M 5.5 BK466856150 BK466844M 5.937 BK466857160 BK466845M 6.312 BK466858170 BK466846M 6.687 BK466859

Subplates and Manifold BlocksSee “Subplates and AuxiliaryConnection Plates” catalog 2425.

Hydraulic FluidsMaterials and seals used in these valvesare compatible with :Anti-wear petroleum oils L-HM. . . . . . . . Water glycols L-HFC. . . . . . . . . . . . . . . . Invert emulsions L-HFB. . . . . . . . . . . . . . Non-alkyl basedphosphate esters L-HFD. . . . . . . . . . . . . The extreme operating range is 500 to 13 cSt (270 to 70 SUS) but therecommended running range is 54 to 13cSt (245 to 70 SUS). For furthertechnical information about fluids see 694.

Filtration RequirementsRecommendations on filtration methodsand the selection of products to controlfluid condition are included in Vickerspublication 561 or 9132. For products inthis catalog the recommended fluidcleanliness levels are:Up to 210 bar (3050 psi) 18/16/13. . . . . Above 210 bar (3050 psi) 17/15/12. . . .

Temperature LimitsAmbient range –20�C to +80�C. . . . . . .

(–4�F to +176�F)

Fluid temperatures

Petroleum Water-oil containing

Min. –20�C +10�C(–4�F) (+50�F)

Max.* +80�C +54�C(+176�F) (+129�F)

* To obtain optimum service life from both fluid andhydraulic system, 65�C (150�F) is therecommended maximum fluid temperature, exceptfor water-containing fluids.

For other fluids where limits are outsidethose of petroleum oil, consult fluidmanufacturer or Vickers representative.Whatever the actual temperature range,ensure that viscosities stay within thosespecified under “Hydraulic Fluids”.

22

% F

acto

r

80

100

120

140

160

15 25 35 45 55 65 75 85 cSt

75 100 150 200 250 300 350 400 SUS

Viscosity

Pressure Drop atOther ViscositiesPublished pressure drop data is valid fora fluid viscosity of 21 cSt (102 SUS).The graph shows the approximatepercentage change in pressure drop fora range of other viscosities. Todetermine the approximate pressuredrop for any given fluid viscosity, multiplythe published data by the % factor forthe required viscosity.

Type H AdjusterTo adjust valve setting, slacken M4 lockingscrew and rotate knob . Re-tighten locking screwafter completing adjustment.

Available onDGMC-3DGMR-3DGMX-3

89 (3.5) max.

Ø32 (1.26 dia)

M4 locking screw2 (5/64) A/F hex. socket

Type K AdjusterKey must be inserted and turned to allow valve to beadjusted . When key is removed, adjustmentmechanism can be freely turned without changingvalve setting.

Available onDGMC-3DGMR-3DGMX-3

Ø32 (1.26 dia)

115 (4.5) max.25(1)

18 (0.71)for key removal

Turn clockwise to increase pressure;counter-clockwise to decrease pressure

Spare PartsValves are sold complete with all seals.Part numbers for available spare sealkits:DGMC-3-40/41 870738. . . . . . . . . . . . . . DGMC2-3-40/41 870737. . . . . . . . . . . . . DGMR(1)-3-40/41 870739. . . . . . . . . . . DGMX(*)-3-40/41 870739. . . . . . . . . . . . DGMDC-3-40/41 870708. . . . . . . . . . . . DGMPC-3-40/41 870708. . . . . . . . . . . . DGMFN-3-40/41 870707. . . . . . . . . . . . .

Note: Seal kits cover various model options for therespective types. Redundant seals will be found forsome models.

Warranty and RepairUnits to be returned under warrantyshould be sent, with a description of thefault, to the Vickers representative inyour area.

Repair of these size 03 valves is notgenerally economically viable. Contactyour nearest Vickers representativebefore returning any unit for repair.

Ordering ProcedureSpecify requirements by valve modelcode, and by seal kit number.

23

Further Information